[net-next,0/6] ravb: Align Rx descriptor setup and maintenance

Message

Niklas Söderlund Feb. 27, 2024, 1:40 a.m. UTC

Hello,

When RZ/G2L support was added the Rx code path was split in two, one to 
support R-Car and one to support RZ/G2L. One reason for this is that 
R-Car uses the extended Rx descriptor format, while RZ/G2L uses the 
normal descriptor format.

In many aspects this is not needed as the extended descriptor format is 
just a normal descriptor with extra metadata (timestamsp) appended. And 
the R-Car SoCs can also use normal descriptors if hardware timestamps 
where not desired. This split has lead to RZ/G2L gaining support for 
split descriptors in the Rx path while R-Car still lacks this.

This series is the first step in trying to merge the R-Car and RZ/G2L Rx 
paths so features and bugs corrected in one will benefit the other.

The first patch in the series clarify that the driver now supports 
either normal or extended descriptors, not both at the same time by 
grouping them in a union. This is the foundation that later patches will 
build on the align the two Rx paths.

Patch 2-5 deals with correcting small issues in the Rx frame and 
descriptor sizes that either where incorrect at the time they were added 
in 2017 (my bad) or concepts built on-top of this initial incorrect 
design.

While finally patch 6 merges the R-Car and RZ/G2L for Rx descriptor 
setup and maintenance.

When this work has landed I plan to follow up with more work aligning 
the rest of the Rx code paths and hopefully bring split descriptor 
support to the R-Car SoCs.

Niklas Söderlund (6):
  ravb: Group descriptor types used in Rx ring
  ravb: Make it clear the information relates to maximum frame size
  ravb: Create helper to allocate skb and align it
  ravb: Use the max frame size from hardware info for RZ/G2L
  ravb: Move maximum Rx descriptor data usage to info struct
  ravb: Unify Rx ring maintenance code paths

 drivers/net/ethernet/renesas/ravb.h      |  20 +--
 drivers/net/ethernet/renesas/ravb_main.c | 205 ++++++++---------------
 2 files changed, 79 insertions(+), 146 deletions(-)